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Metal-based self-lubricating composite coating and preparation method thereof

A composite coating, self-lubricating technology, applied in metal material coating process, coating, vacuum evaporation coating and other directions, can solve the problems of large internal stress of the film, high surface temperature, failure, etc., and achieve the performance of friction reduction and noise reduction High, improve reliability, reduce frictional heat effect

Active Publication Date: 2015-07-01
东台市五烈镇乡镇企业集体资产经营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] DLC has excellent tribological properties, and it has been used as a protective film in industry, but it will decompose when it is used at high temperature and in contact with reactive materials. Stress makes it difficult for the film to form a film on the metal surface, and wrinkling occurs, resulting in a large number of stress relief patterns, which directly lead to early failure during use
[0008] However, the linear velocity of the swash plate transmission joint assembly is very high, the wear rate is fast, the surface temperature is high, and the frictional heat has a great influence on the mechanical properties of the base metal, and the existing solid self-lubricating composite film can no longer meet its requirements Due to the requirements of use, it is necessary to prepare a self-lubricating composite coating that can greatly reduce friction and noise with both thermal barrier properties and self-lubricating properties.

Method used

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  • Metal-based self-lubricating composite coating and preparation method thereof

Examples

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preparation example Construction

[0038] prepared as figure 1 The preparation method of the shown metal-based self-lubricating composite coating comprises the following preparation steps in turn:

[0039] Step 1: mix mixture P with nano-Cr powder and Y 2 o 3 According to the mass ratio of the components, it is mixed by ball milling. After mixing, powder is spread on the surface of the base metal 1 with a thickness of 1.5 mm. The thermal barrier transition layer 2 is prepared by laser cladding. The laser cladding parameters used are: frequency 14-18Hz , pulse width 5~8ms, current 140~170A, speed 150mm / min, spot width 0.8~1.5mm; preheat to 90℃~100℃ before cladding, cool slowly for 10s after cladding, and grind after laser cladding Process until the required thickness D1 is 0.1-0.3mm. The prepared thermal barrier transition layer can effectively reduce the diffusion of frictional heat to the base metal, and reduce the influence of frictional heat on the mechanical properties of the base metal.

[0040] Step 2...

Embodiment 1

[0044] Example 1: The base material of an engine ball head and ball seat is 30CrMnSiA, and the surface coating was originally made of C / Cr graphite composite film. It was found that the oil loss lubrication life was only 12 minutes, and the vibration noise was relatively large. However, the performance of the self-lubricating composite coating prepared by the present invention is greatly improved.

[0045] The preparation method is as follows: 85% mixture P, 13% nano-Cr powder and 2% Y 2 o 3 Carry out ball milling and mixing, wherein the component mass ratio of the mixture P includes 50% zirconia, 20% aluminum oxide, 4% palladium oxide, 26% Ni powder; after mixing, spread powder on the surface of the base metal, laser melt The cladding adopts frequency 16Hz, pulse width 5ms, current 160A, speed 150mm / min, spot width 0.8mm, powder coating thickness 1.5mm, two-layer cladding, preheating to 90°C before cladding, and slow cooling for 10s after cladding. A thermal barrier transit...

Embodiment 2

[0047] Example 2: A gear base material is a copper alloy, and the present invention is used to prepare a self-lubricating composite coating on the surface of the base body.

[0048] The preparation method is as follows: 83% mixture P, 15% nano-Cr powder and 2% Y 2 o 3 Carry out ball milling and mixing, wherein the component mass ratio of the mixture P includes 45% zirconia, 20% aluminum oxide, 4% palladium oxide, 31% Ni powder; after mixing, spread powder on the surface of the base metal, laser melt The cladding adopts frequency 18Hz, pulse width 6ms, current 150A, speed 150mm / min, spot width 1.0mm, powder coating thickness 1.5mm, two-layer cladding, preheating to 90°C before cladding, and slow cooling for 10s after cladding. A thermal barrier transition layer with a thickness of 0.3mm was obtained; the composition of the self-lubricating middle layer was 98% NiCrSiB-401 and 2% carbon fiber, which was preset by plasma spraying method, the spraying current was 400A, the voltag...

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Abstract

The invention discloses a metal-based self-lubricating composite coating; the metal-based self-lubricating composite coating comprises a thermal barrier transition layer, a self-lubricating interlayer and a self-lubricating working layer which are sequentially coated from the surface of base metal; the thermal barrier transition layer comprises 83-88% of a mixture P, 10-15% of nano Cr powder and 2% of Y2O3; the mixture P comprises 45-50% of zirconium oxide, 12-20% of aluminium oxide, 2-4% of palladium oxide and 26-41% of Ni powder; the self-lubricating interlayer comprises 91-98% of NiCrSiB-401 and 2-9% of carbon fibre; and the self-lubricating working layer comprises 2-8% of Cr, 0.2-5% of Y, 0.3-5% of Ce, 0.2-6% of Ta and the balance of C. The metal-based self-lubricating composite coating disclosed by the invention has the advantages of being high in thermal barrier property, self-lubricating property, friction reduction and noise reduction properties and the like.

Description

technical field [0001] The invention relates to a self-lubricating composite coating, in particular to a metal-based self-lubricating composite coating and a preparation method thereof, and belongs to the technical field of composite materials for matrix surface strengthening treatment. Background technique [0002] The surface of many mechanical parts and other substrates needs to be enhanced with high hardness, wear resistance, high temperature resistance, corrosion resistance and contact fatigue resistance. The current anti-friction and noise reduction coatings mainly include diamond-like carbon coating (DLC), nitride coating, carbide coating, carbonitride coating, graphite and MoS2-based coating. [0003] DLC has excellent tribological properties, and it has been used as a protective film in industry, but it will decompose when it is used at high temperature and in contact with reactive materials. Stress makes it difficult for the film to form a film on the metal surfac...

Claims

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Application Information

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IPC IPC(8): C23C24/10C23C14/06C23C14/35C23C4/10C23C4/067C23C4/134
Inventor 吴梦陵王辛张珑王鑫刘飞
Owner 东台市五烈镇乡镇企业集体资产经营有限公司
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